I have not looked this up in the Book of Discipline, but these answers are based on my experience in the UMC. The Local Pastor who is to be away may consecrate the elements, but only for his/her assigned

Yes. Normally it is up to the pastor's discretion. Most pastors I know would allow this. I've seen it happen frequently. E.g., my daughter was married in our church, where she was confirmed, by a pastor